Method for constructing active magnetic bearing controller based on look-up table method

A method for constructing an active magnetic bearing controller based on a look-up table method, comprising the following steps:

• step (1):
• building finite element models of an active magnetic bearing, and. obtaining, by using the finite element models and based on a general universal Kriging model, two universal Kriging prediction models about actual suspension forces {circumflex over (F)}x, {circumflex over (F)}y being in association with actual displacement eccentricities {circumflex over (x)}0, ŷ0 and actual control currents îx, îy in X-axis and Y-axis directions;
• step (2):
• creating, based on the two universal Kriging prediction models, two model state tables about the actual suspension forces {circumflex over (F)}x, {circumflex over (F)}y being in association with the actual displacement eccentricities {circumflex over (x)}0, ŷ0 and the actual control currents îx, îy to construct two corresponding look-up table modules with the two model state tables being built in, respectively;
• and
• step (3):
• constructing an active;
• magnetic bearing controller by using two fuzzy adaptive proportional-integral-derivative (PID) controllers, two amplifier modules, two look-up table modules, and two measurement modules in the X-axis and Y-axis directions, wherein the fuzzy adaptive PID controller, the amplifier module, and the look-up table module in the X-axis direction are connected in series and then connected to an input end of the active magnetic bearing;
• the fuzzy adaptive PID controller, the amplifier module, and the look-up table module in the Y-axis direction are connected in series and then connected to the input end of the active magnetic bearing;
• the two measurement modules in the X-axis and Y-axis directions measure the actual displacement eccentricities {circumflex over (x)}0, ŷ0 of the active magnetic bearing in the X-axis and Y-axis directions, respectively;
• the actual displacement eccentricities {circumflex over (x)}0, ŷ0 are input into the two corresponding look-up table modules, respectively;
• reference displacements x*, y* in the X-axis and Y-axis directions are subtracted from the corresponding actual displacement eccentricities {circumflex over (x)}0, ŷ0 to obtain displacement errors ex, ey, respectively;
• initial control currents Ix0, Iy0 are obtained through the corresponding fuzzy adaptive PID controllers by using the displacement errors ex, ey, and actual control currents îx, îy are obtained through the corresponding amplifier modules by using the initial control currents Ix0, Iy0, respectively;
• the actual control currents îx, îy are input into the corresponding look-up table modules, and the two look-up table modules output the corresponding actual suspension forces {circumflex over (F)}x, {circumflex over (F)}y to the active magnetic bearing.